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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_RESOURCE_COORDINATOR_DISCARD_METRICS_LIFECYCLE_UNIT_OBSERVER_H_
#define CHROME_BROWSER_RESOURCE_COORDINATOR_DISCARD_METRICS_LIFECYCLE_UNIT_OBSERVER_H_
#include "chrome/browser/resource_coordinator/lifecycle_unit_observer.h"
#include "base/time/time.h"
#include "chrome/browser/resource_coordinator/lifecycle_unit_state.mojom.h"
namespace resource_coordinator {
using ::mojom::LifecycleUnitState;
// Observes a LifecycleUnit to record metrics.
class DiscardMetricsLifecycleUnitObserver : public LifecycleUnitObserver {
public:
DiscardMetricsLifecycleUnitObserver();
DiscardMetricsLifecycleUnitObserver(
const DiscardMetricsLifecycleUnitObserver&) = delete;
DiscardMetricsLifecycleUnitObserver& operator=(
const DiscardMetricsLifecycleUnitObserver&) = delete;
~DiscardMetricsLifecycleUnitObserver() override;
// LifecycleUnitObserver:
void OnLifecycleUnitStateChanged(
LifecycleUnit* lifecycle_unit,
LifecycleUnitState last_state,
LifecycleUnitStateChangeReason reason) override;
void OnLifecycleUnitDestroyed(LifecycleUnit* lifecycle_unit) override;
private:
// Invoked when the LifecycleUnit is discarded.
void OnDiscard(LifecycleUnit* lifecycle_unit,
LifecycleUnitStateChangeReason reason);
// Invoked when the LifecycleUnit is reloaded.
void OnReload();
// The last time at which the LifecycleUnit was focused, updated when the
// LifecycleUnit is discarded.
base::TimeTicks last_focused_time_before_discard_;
// The last time at which the LifecycleUnit was discarded.
base::TimeTicks discard_time_;
// The last discard reason.
LifecycleUnitStateChangeReason discard_reason_ =
LifecycleUnitStateChangeReason::BROWSER_INITIATED;
// The last time at which the LifecycleUnit was reloaded after being
// discarded.
base::TimeTicks reload_time_;
};
} // namespace resource_coordinator
#endif // CHROME_BROWSER_RESOURCE_COORDINATOR_DISCARD_METRICS_LIFECYCLE_UNIT_OBSERVER_H_
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